Shoe-sewing machine



(No Model.)

' G. R. PEARVE.

SHOE SEWING MACHINE.

515555159. Patented M51. 10,1895. A

.9, NVEN WTNESEEE:

m Wg@ UNITED STATES PATENT OFFICE.

GEORGE R. PEARE, OF LYNN, ASSIGNOR TO THE STEAM-IIEATED HORN COMPANY, OFBOSTON, MASSACHUSETTS.

SHOE-SEWING IVIACHINE.

SPECIFICATION forming part of Letters Patent No. 556,159, dated March10, 1896.

Application filed February 17, 1893. Serial No. 462,797. (No model.)

To all whom t may concern:

Be it known that I, GEORGE R. PEARE, of Lynn, in the county of Essex andState of Massachusetts,have invented certain new and useful Improvementsin Electrical Heaters for Shoe-Sewing Machines, of which the followingis a specification.

The object of this invention is to provide means whereby electricity maybe employed for heating the horn of a shoe-sewin g machine, and also thewax-pot which contains the wax to be used on the threads.

I have chosen to illustrate the invention as applied to a machine of thewell-known Mc- Kay type; but it will be evident that it is capable ofapplication to many other forms of machines.

Of the accompanying drawings, which illustrate a construction by whichtheV invention may be carried out, Figure 1 shows an elevation of ashoe-sewing machine of the McKay type to which my invention is applied,portions of the machine being broken away to illustrate interiorconstructions. Fig. 2 shows a partial sectional and side elevation ofthe horn and wax-pot, the parts appearing on a larger scale than inFig. 1. Fig. 3 shows a sectional view of the end portion of the horn ona larger scale. Fig. 4c shows a perspective view of the electricalheater for heating the horn, partially broken away at one side. Fig. 5shows aperspective view of a metallic jacket which is iitted over theheater. Fig. 6 shows a horizontal sectional view of the bottom portionof the wax-pot, showing the electrical heater therein.

The same letters of reference indicate the same parts in all theiigures.

In the drawings, the reference-letter a designates the frame of a McKaymachine; b, a rotary horn; c, a wax-pot attached to or formed with saidhorn, and d a rotary spindle on which the horn and wax-pot are mounted.

The horn b is formed with a cylindrical bore b', which receives a coree, which may be formed of any suitable heat-conductin g and insulatingmaterial-such as porcelain, for instance-and has a central longitudinalpassage c', occupied by the whirl-spindle e2. An electrical conductor e3is carried in a series of return-bends through the body of the core e,

and this conductor will be of material, such as platinum, affordingsufficient resistance to the passage of the electric current to producea considerable quantity of heat. A cylindrical jacket e4, preferablyformed of metal and closed at one end, fits over t-he core e and isprovided with a central tube e, which engages the passage e of saidcore. The core and jacket will be iitted in the horn, as shown in Fig.3, and confined therein by a plug f, having provision for the passage ofthe electrical connecting-wires f, which are joined respectively withthe ends of the conductor c3. When an electric current is passed throughthe said conductor e3, sufficient heat will be generated in the core toproperly heat the horn b and maintain it at the desired temperature.

The wax-pot c is formed with a chamber g under its bottom, in which is abed g2 of insulating material. A conductor g3, of platinum 0r othersuitable material offering a resistance to the passage of an electriccurrent, is passed in return-bends over the bed of insulation g2. Whenan electric current is passed through the conductor g3, the heatgenerated therein is. all radiated upward to heat the wax in the pot,the bed of insulation g2 preventing wasting of the heat by radiatingdownward. A water-chamber g4 will preferably be provided between thewax-pot and the heatchamber g. By keeping said chamber g4 filled withwater the waX in the pot will be prevented from burning.

The two heaters will be suitably connected with some source ofelectricity, and proper provision will be made for cutting them in andout.

It will be seen that with such an arrangement the heating of the hornand wax-pot may be easily controlled and the horn and wax-pot kept atthe proper heat without detriment to the threads which pass through thehorn.

In the present instance I have shown as a means of supplying an electriccurrent to the heaters a dynamo h,which is connected with a rotary partof the machine-as, forinstance, by belting h, as shown in the drawings.The opposite poles of the dynamo will be suitably connected with theheaters. The horn and wax-pot being rotary parts, a sliding connec- IOOnection of some kind is necessary between the heaters and the dynamo orother source of electricity. I have provided for this by theconstruction illustrated in the drawings, which will now be described,it being understood that other means might be employed to accomplish thesame result. One of the conducting-wires f' is connected by'means of abinding-post i with one end of the wax-potheating conductor g3, whileanother conducting-wire i" is connected with the opposite end of saidconductor g3. The other wire f and the wire t" are carried downalongside the spindle d through suitable insulation t2, and areconnected, respectively, with two collars j formed on said spindle andsuitably separated by insulation. A pair of electrodes 7c are secured tothe frame of the machine and bear with sliding Contact on the twoeollarsj, respectively. These electrodes are connected byconducting-wires k with the poles of the dynamo 7L. It will now be seenthat as the horn rotates with its spindle D the electrical connectionfrom the dynamo to the heaters is not in any way disturbed, as theelectrodes 7c remain in contact with the collarsj.

It is evident that a battery-current may be employed instead of adynamo, or that the heaters might be supplied from any suitable sourceof electricity. Ido not, therefore, coniine myself to the means hereshown forsupplying the heaters with an electric current, or to theconstruction of the heaters, as this might be varied in many ways.

The core e with its resistance-conductor e3 constitutes distinctly aheat-generating device in the sense thatheat is generated therein and isnot communicated thereto, as inv the case of steam or hot-air pipes.This heatgenerating device is located within the horn and is adapted toimpart heat only to that part of the machine requiring it; and the saidheat-generating device being once located in the horn need not beremoved, nor need the machine be stopped in order to supply the devicewith fuel, as would be the ease with a lamp located in the horn.

Having thus described my inventiomwhat I claim as new, and desire tosecure by Letters Patent, is-

l. A shoe-sewing machine comprising in its construction a horn supportedon a rotatable spindle which carries a pair of collars insulated fromeach other, a heat-generating device located in said horn and consistingof an electrical heater, conductors leading 'from the said heater andconnected respectively with the collars on the spindle, and electrodeshaving sliding contact with said collars and connected with oppositepoles of an electrical generator.

2. In a shoe-sewing machine, ahorn having an inclosed bore or cavityextending in the direction of its length, an electrical heater in theform of a core which occupies said inclosed cavity and is provided witha longitudinal passage for the whirlspindle, and the whirl-spindleextending through said corcheater.

In a shoe-sewing machine, a horn having an inelosed bore or cavityextending in the direction of its length, an electrical Vheater in theform of a core which occupies said inclosed cavity and is provided witha longitudinal passage, the whirl-spindle extending through saidcore-heater', and a metallic casing extending over the core and thesides ofi the longitudinal passage therein.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 10th day ol February, A. D.1893.

GEO. R. IEARE.

fitnessesz C. l. BROWN, PARKER Davis.

